what projects have you guys been doing

[Neutrideo]

Going strong guys

[Salacious B Crum]

On 9/16/2017 at 8:26 PM, bob345 said:

Got some custom pcb's made

Nice!

[Pixel5]

10 hours ago, Neutrideo said:

Going strong guys

dude you can stop bumping that post all the time with how strong it is going, its not going to get you a pinned post just because its getting bumped all the time.

[Hackentosher]

30 minutes ago, Pixel5 said:

dude you can stop bumping that post all the time with how strong it is going, its not going to get you a pinned post just because its getting bumped all the time.

Calm down, he hasn't done it too much.

[Pixel5]

58 minutes ago, Hackentosher said:

Calm down, he hasn't done it too much.

you can clearly see hes doing that every now and then when the post starts going down and it just started after someone told him it could get pinned when it becomes an active big post.

No idea why hes so focus on getting a post pinned that he created.

[Hackentosher]

2 hours ago, Pixel5 said:

you can clearly see hes doing that every now and then when the post starts going down and it just started after someone told him it could get pinned when it becomes an active big post.

No idea why hes so focus on getting a post pinned that he created.

TBH there's not enough activity or threads in this subforum. It usually stays near the top along with the Multicopter Megathread.

 

Look at the LGBT thread in off topic. So much shit happens in that sub forum, but the LGBT thread stays near the top. Same with The Garage. If the community wants to see a thread be active, they'll make it active. I've come to the realization that pinned posts are more informational and less discussion. 

[NoTxtWhileDrive]

I been working on a Raspberry pi zero w with Octoprint to serve as my file server for my 3d printer. pretty bog standard installation but hit alot of snags in along the road and almost destroyed my printer in more than one occasion while doing it. 

[Hackentosher]

5 hours ago, NoTxtWhileDrive said:

I been working on a Raspberry pi zero w with Octoprint to serve as my file server for my 3d printer. pretty bog standard installation but hit alot of snags in along the road and almost destroyed my printer in more than one occasion while doing it. 

Hey as long as you don't get a huge puff of smoke from the bottom, it's aaaalllllriight. (I don't speak from experience, what are you talking about?) 

[Neutrideo]

I just finished a tech event in taiwan. Quite fun, showed some white hacking techniques. Some new info i never new.

[Unimportant]

As a little one day project I built me a little capacity tester to cull my stash of 18650 lithium-ion batteries.

It simply discharges the battery trough a 10 ohm resistor and a PIC18F1220 measures the current and integrates it over time. Stops when cell voltage reaches 3V.

[Salacious B Crum]

1 hour ago, Unimportant said:

As a little one day project I built me a little capacity tester to cull my stash of 18650 lithium-ion batteries.

It simply discharges the battery trough a 10 ohm resistor and a PIC18F1220 measures the current and integrates it over time. Stops when cell voltage reaches 3V.

Nice is that Arduino based or is the circuit for the lcd output made from scratch?

[Salacious B Crum]

Here is the progress on my first major project: This is a system for measuring the moisture content of 4 zones/pots that will monitor, feed and water plants (no not pot) I have the solenoid valves in route and I will be creating a 5 gallon system that will apply a metered amount of a food/fertilizer mix (liquid) this is running on 5 volt logic (Arduino nano) here's some photo's of the progress:

 

[Unimportant]

4 hours ago, mrbilky said:

Nice is that Arduino based or is the circuit for the lcd output made from scratch?

Made from scratch on a piece of perfboard and parts I had in the junk bin.

[Lolucoca]

I really haven't been doing an awful lot lately. I may have just acquired a dead 4ch 100MHz scope which I'm planning to fix but I'm not sure...

 

[bob345]

Got new pcb's for my antenna switch design. Tested pretty thoroughly today and it works great! Also, white pcb's are awesome.

 

[Hackentosher]

Just now, bob345 said:

Got new pcb's for my antenna switch design. Tested pretty thoroughly today and it works great! Also, white pcb's are awesome.=

 

 

so what are you building?

[bob345]

Just now, Hackentosher said:

so what are you building?

just a simple switch to easily change antennas. Intended for rtl-sdr stuff. Im working on a full on sdr design that will use a similar software controlled antenna switching circuit.

[Unimportant]

Prototype PCB for the power stage of a high power BTL class D audio amplifier I'm designing. You can see the 2 MOSFETS and inductor for each side of the bridge, buffer capacitors and a 7812 on the right side supplying power to the PWM board. The gate drivers are on the backside, along with other SMD components. PWM is currently supplied by (ab)using a TL494, which actually results in amazingly good audio quality for a chip that's actually meant for switchmode power supplies. Once the power stage is fully debugged I'm planning on building the PWM driver from scratch.

 

Issues:

• Still too much parasitics, the PCB should be smaller still, using SMD mosfets and smarter layout.
• With gate resistors, the idle power usage is somewhat high and the MOSFETS get slightly warm, which should not happen. Suspecting shoot-trough or the resistor interfering with the gate driver's adaptive dead time.
• Without gate resistors the idle usage is low and the MOSFETS stay ice-cold. However at high volume the gate driver goes into latchup (and soon dies). Suspecting parasitic inductance generating negative voltage on the switching node when the top FET turns off. Hard to prove tough.

[Unimportant]

On 11/3/2017 at 5:37 AM, bob345 said:

Also, white pcb's are awesome.

Indeed, where did you have these made ?

[bob345]

3 hours ago, Unimportant said:

Indeed, where did you have these made ?

I had them made by elecrow. Pretty great quality.

[blepmaster]

Right now, I have been experimenting with RetroPie and Emulation. It is really interesting to learn how different emulators work, collecting ROMS, and optimizing the way certain emulators run.

[Neutrideo]

On 11/7/2017 at 4:57 AM, blepmaster said:

Right now, I have been experimenting with RetroPie and Emulation. It is really interesting to learn how different emulators work, collecting ROMS, and optimizing the way certain emulators run.

I love retropie, i have one connected to my monitor, and when i want to procrastinate, i switch and play mario games!

[Unimportant]

Waveforms from the prototype, mesmerizing somehow.

 

Class_D_Waveforms.mp4

 

Top: 300Khz PWM modulated carrier.

Bottom: Post LC filtered output on one side of the bridge.

 

The noise on the top and bottom of the PWM is caused by the scope probe, it's much better when measured using proper grounding, but this was a quicky.

[bob345]

Got some really small pcb's made. It's for an rgb network status led for a 24 node raspberry pi cluster I'm building.

[Salacious B Crum]

16 minutes ago, bob345 said:

Got some really small pcb's made. It's for an rgb network status led for a 24 node raspberry pi cluster I'm building.

Looking sweet! How do you like the Pi over arduino I'm thinking of buying one they are more computer like no?